A sculpture teach at the Institute of American Indian Arts in Santa Fe, Coffin received a Ford Foundation Grant.  He was awarded a National Teaching Fellowship.

Major public collections including his work are the Heard Museum in Phoenix, AZ; the Wheelwright Museum in Santa Fe, NM; the Institute of American Indian Art in Santa Fe, NM and the National Museum of American Indian in Washington, D.C.  Coffin is cited in Who's Who in American Art.